The CentralAlert CA360 from Serene Innovations is an all-in-one notification system for your home. It alerts you to all the daily sounds in your home such as alarm clock, door, phone, baby, and alarm sound from your audio alarms, warnings from your motion detectors and storm warning from your NOAA radio and more*. It has a bright built-in flasher, a selectable loud yet pleasant audible sound and a powerful bed shaker to alert you. There is no installation needed for the CA360, and all operations are wireless. Features: Alarm clock has adjustable brightness display, dual alarm settings and dual bed shaker jacks (one bed shaker included) Adjustable loud audio sound and bright flasher Big and easy to see alerting icons 2.4GHz frequency Up to 200 ft operating range Dimensions: 6.5" x 4.5" x 2.25" Battery backup 4 AA NiMH* Click for user manual Options available: Standard ($179.95) (pictured above) Alerts to alarm clock, doorbell, door knocks, audio alarm, baby, weather, motion and more* Hotel ($199.95) An unlimited number of CentralAlert CA360 system can be used in close proximity, such as in apartment buildings or hotels Alerts to alarm clock, doorbell, door knocks, phone/fax, audio alarm, baby, weather, motion and more* Supports up to 4 CA-DB doorbells and CA-DX door knock sensors (in any combination) Supports up to 10 CA-RX remote receivers, 10 CA-PX personal pagers, 10 CA-AX audio sensors, 4 CA-SOS emergency SOS pendants, 3 CA-BX baby cry sensors, 1 CA-CX phone sensor and 1 CA-NOAA weather alert sensor 1.25" bright clock display Uses 520Hz square-wave technology for maximum audio alert, found to be more effective in alerting people with hearing loss